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Peng Xi Feng
Ophthalmology
About me
Shenzhen Longgang Central Hospital, Ophthalmology Deputy Chief Physician.
Proficient in diseases
Familiar with the diagnosis of various common eye diseases such as cataracts, glaucoma, eye trauma, and ocular surface diseases, skilled in eye fluorescein angiography, electrophysiology, eye A/B ultrasound and other examinations.
Voices
The difference between conjunctivitis and keratitis.
Conjunctivitis, also known as acute or subacute conjunctivitis, and keratitis are among the most common diseases of the ocular surface, but they are different. Firstly, the locations of the cornea and conjunctiva are different. The cornea is a transparent, avascular tissue through which light enters the eye, allowing people to see. The conjunctiva is divided into the bulbar conjunctiva and the palpebral conjunctiva. Inflammation occurring on the cornea is called keratitis, while inflammation on the conjunctiva is referred to as conjunctivitis. Symptoms of conjunctivitis include congestion, foreign body sensation, photophobia, and tearing, among others. The symptoms of keratitis include a significant foreign body sensation, distinct pain, often affecting vision, and accompanied by photophobia.
Can chronic keratitis cause blindness?
Chronic bacterial conjunctivitis generally does not cause blindness. Its main clinical symptoms include itching, burning, dryness, eye pain, and visual fatigue. The conjunctiva is mildly congested and may be accompanied by thickening of the palpebral conjunctiva, papillary hypertrophy, and mucous secretions. Moraxella can cause canthal conjunctivitis, which is accompanied by crusting and ulceration of the skin at the outer canthus, and hypertrophy of the palpebral conjunctiva's papillae and follicles. Staphylococcus aureus infections are often accompanied by ulcerative blepharitis, or peripheral corneal punctate infiltration.
Is refractive amblyopia easy to treat?
Early detection, treatment, and training for refractive amblyopia can potentially restore normal vision, but the extent of recovery varies from person to person. Since the principles behind various amblyopia treatment methods differ and have their advantages, comprehensive therapy is superior to single therapy. For a child with amblyopia in one eye, the routine initially involves covering the healthy eye to give the amblyopic eye more focused exercise, combined with precise visual acuity training, stimulation from amblyopia treatment devices, and so forth. After months or years of treatment, the child's vision in the amblyopic eye will show significant and rapid improvement.
Postoperative complications of cataract surgery
Complications after cataract surgery are relatively common and include the following types: First, incision leakage, leading to a shallow anterior chamber; Second, pupil block; Third, damage to the corneal endothelium, causing persistent corneal edema, and even bullous keratopathy; Fourth, anterior chamber hemorrhage; Fifth, epithelial implantation in the anterior chamber; Sixth, postoperative uveitis; Seventh, increased intraocular pressure; Eighth, abnormal positioning or dislocation of the intraocular lens; Ninth, macular edema, and retinal detachment can also occur.
Can conjunctivitis be treated with warm compresses?
Conjunctivitis can be treated with warm compresses. If the eye pain is due to an infection, warm compresses can soothe the eyes and reduce redness and discomfort. However, it is important to note that a wet, warm towel can cause the infection to spread from one eye to the other. Therefore, remember to use different towels for each eye, and ensure that the towel is clean before each application. When cleaning the eyes, remember to wipe from the inside out, starting from the side closest to the nose and moving outward. Always use a clean side of the towel for each wipe to ensure that any removed secretions do not get wiped back into the eye.
Conjunctivitis is treated how?
Conjunctivitis is treated based on the cause, primarily with local medication and systemic treatment when necessary, and it is advisable to avoid bandaging the affected eye during the acute phase. First, eye drops are the most basic method of administering medication for treating conjunctivitis. Second, eye ointment should preferably be applied before bedtime. Third, when there is excessive secretion in the conjunctival sac, it is necessary to rinse the conjunctival sac. Fourth, severe conjunctivitis, such as gonococcal conjunctivitis, requires systemic treatment with antibiotics or sulfonamides.
The difference between open-angle and closed-angle glaucoma
Primary angle-closure glaucoma is a type of glaucoma caused by the peripheral iris blocking the trabecular meshwork, or permanently adhering to the trabecular meshwork, obstructing the outflow of aqueous humor, leading to increased intraocular pressure. It is characterized by a narrow angle and the anatomical feature of the peripheral iris being prone to contact with the trabecular meshwork. Gonioscopy confirming angle closure is an important diagnostic criterion. The characteristic of open-angle glaucoma, however, is that even though intraocular pressure is elevated, the angle remains open, with the obstruction of aqueous outflow occurring at the trabecular meshwork system.
How many days can conjunctivitis heal?
Conjunctivitis can be categorized by the speed of onset into hyperacute, subacute, acute, and chronic types. It can also be classified by severity into mild, moderate, and severe. Acute conjunctivitis usually is self-limiting, with the condition lasting about two weeks. Effective localized treatment and administration of sensitive antibiotics can lead to recovery within a few days. In contrast, chronic conjunctivitis is not self-limiting and is more challenging to treat.
Can trachoma cause blindness?
Trachoma is a chronic infectious conjunctivitis and keratitis caused by Chlamydia trachomatis, which can lead to blindness if left untreated. After the acute phase of trachoma is cured, it may leave no scars and not affect vision. However, repeated infections can lead to scarring, and in severe cases, complications may endanger vision. Entropion and trichiasis, where eyelashes constantly rub against the cornea, can cause the cornea to become opaque and form ulcers, leading to blindness. Chlamydia trachomatis can cause epithelial keratitis, and at the ends of corneal vascular pannus, corneal infiltration can occur along with entropion and trichiasis, which in turn exacerbates the damage to the cornea, causing opacification and leading to blindness.
What is glaucoma?
Glaucoma is one of the main blinding eye diseases in ophthalmology, with a certain genetic predisposition, affecting 10 to 15 percent of direct relatives of patients. Intraocular pressure is the pressure exerted by the contents within the eyeball against its inner wall. Glaucoma is a group of diseases characterized by distinctive optic nerve atrophy and visual field defects, and pathologically increased intraocular pressure is one of the main risk factors for glaucoma. The level of increased intraocular pressure and the tolerance of the optic nerve to pressure damage are primarily related to the occurrence and progression of glaucomatous optic nerve atrophy and visual field defects.